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post #1 of 14 (permalink) Old 04-26-2017, 06:57 PM Thread Starter
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0 kh

Ok so I moved out a few months ago and had to leave my tanks at my parents house for now until I can figure out what to do with them. I was doing a water change today and noticed my kh is at 0, my gh is at 8-9. It's a 90 gallon tank with injected co2. My question is, is my kh ok like that ? I tested my tap water and it's around 6kh so I don't know or understand what's going on with my kh. The tank is a bit of a mess right now and full of all kinds of algae, I don't even know where to start with that right now lol.

Should I be worried about my kh ? And if so how to I correct the problem. I'm not sure where my nitrate is since I ran out of the testing liquid but everything else seems ok. My ph drop is about 7.6 down too 6.2ish but then again I haven't calibrated the controller in a long time.
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post #2 of 14 (permalink) Old 04-26-2017, 07:20 PM
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Hi Aceman,

Tom Barr recommends a dKH reading of about 3.0 or greater to avoid a PH crash when injecting CO2. Baking Soda (not baking powder) aka Bicarbonate of Soda will raise the dKH.

1/16 teaspoon of Baking Soda will increase three (3) gallons of water by about 1.0 dKH; it will also increase your PH. I would recommend increasing the dKH slowly over several days to avoid causing distress to any fish. I have managed to melt my Cryptocorynes with a rapid change in dKH / PH.

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post #3 of 14 (permalink) Old 04-26-2017, 07:53 PM
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Originally Posted by Aceman View Post
Ok so I moved out a few months ago and had to leave my tanks at my parents house for now until I can figure out what to do with them. I was doing a water change today and noticed my kh is at 0, my gh is at 8-9. It's a 90 gallon tank with injected co2. My question is, is my kh ok like that ? I tested my tap water and it's around 6kh so I don't know or understand what's going on with my kh. The tank is a bit of a mess right now and full of all kinds of algae, I don't even know where to start with that right now lol.

Should I be worried about my kh ? And if so how to I correct the problem. I'm not sure where my nitrate is since I ran out of the testing liquid but everything else seems ok. My ph drop is about 7.6 down too 6.2ish but then again I haven't calibrated the controller in a long time.
some plants can use carbonates in place of CO2 carbon.. most likely what absorbed your tap Kh..even w/ the CO2 injection you could be short w/ a large biomass/surface agitation/delivery errors...
pH drop generally follows (for me at least), though CO2 injection can have a lot to do w/ it..

Personalty I just throw some "coral sand" in a corner (like a heaping tablespoon and near the filter intake)..Crude but it generally boosts my 40 back to at least 1-2dKh...
Most eventually dissolves..
not saying it is the best way, just a way ...

Suspended for 30 days for being awful to other forum members
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post #4 of 14 (permalink) Old 04-27-2017, 10:41 AM Thread Starter
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Originally Posted by Seattle_Aquarist View Post
Hi Aceman,



Tom Barr recommends a dKH reading of about 3.0 or greater to avoid a PH crash when injecting CO2. Baking Soda (not baking powder) aka Bicarbonate of Soda will raise the dKH.



1/16 teaspoon of Baking Soda will increase three (3) gallons of water by about 1.0 dKH; it will also increase your PH. I would recommend increasing the dKH slowly over several days to avoid causing distress to any fish. I have managed to melt my Cryptocorynes with a rapid change in dKH / PH.


So how much would I need for a 90 ? And I guess I should do like 1dkh per day to avoid shock ?
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post #5 of 14 (permalink) Old 04-27-2017, 02:12 PM
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Hi Aceman,

If it were me, I would do the adjustment over a week or more to avoid shocking sensitive fish.

90 gallon(US), 90 gallon(Imperial) or 90 liter (I see you are in Canada)?

If 90 gallon(US) then I would add 1/2 teaspoon per 24 hours; that should bring you up to about 3.0 dKH in a couple of weeks (not counting water changes)

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post #6 of 14 (permalink) Old 04-27-2017, 02:24 PM Thread Starter
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Originally Posted by Seattle_Aquarist View Post
Hi Aceman,



If it were me, I would do the adjustment over a week or more to avoid shocking sensitive fish.



90 gallon(US), 90 gallon(Imperial) or 90 liter (I see you are in Canada)?



If 90 gallon(US) then I would add 1/2 teaspoon per 24 hours; that should bring you up to about 3.0 dKH in a couple of weeks (not counting water changes)


Yes lol U.S gallons, ok so 1/2 per day, how often should I check it ? It's a little hard since I don't live there but I do go once per week for water changes
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post #7 of 14 (permalink) Old 04-27-2017, 02:29 PM
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Hi Aceman,

After a week, before the water change, check your dKH - it should be up about 1-2 dKH from before you started dosing.

Roy_________
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post #8 of 14 (permalink) Old 04-27-2017, 02:38 PM Thread Starter
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Originally Posted by Seattle_Aquarist View Post
Hi Aceman,



After a week, before the water change, check your dKH - it should be up about 1-2 dKH from before you started dosing.


Awesome, thank you.
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post #9 of 14 (permalink) Old 04-27-2017, 02:45 PM
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I'm just going to guess that you have buffering substrate in your tank, which is "eating" the KH, thus resulting low to 0 KH results... and this also results in lower pH.


Adding in KH to your tank will do two things.... at minimum

Cause pH swings
Cause your substrate to lose it's buffering capacity quicker



If you have buffering substrate, you should be using remineralized RO/DI water using GH+ only. No KH.... unless your tap water automatically came out with 0 KH.
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post #10 of 14 (permalink) Old 04-27-2017, 02:50 PM Thread Starter
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I'm just going to guess that you have buffering substrate in your tank, which is "eating" the KH, thus resulting low to 0 KH results... and this also results in lower pH.





Adding in KH to your tank will do two things.... at minimum



Cause pH swings

Cause your substrate to lose it's buffering capacity quicker







If you have buffering substrate, you should be using remineralized RO/DI water using GH+ only. No KH.... unless your tap water automatically came out with 0 KH.


I can't remember what substrate I have but I'm pretty sure it doesn't buffer anything, plus it's almost 5 years old I say
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post #11 of 14 (permalink) Old 04-27-2017, 11:03 PM
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So the pH drop would be just CO2? Okay.



If the substrate is indeed exhausted, then adding KH in some form may help to stabilize the pH a little... it will still change, but shouldn't as drastically.

Bump: So the pH drop would be just CO2? Okay.



If the substrate is indeed exhausted, then adding KH in some form may help to stabilize the pH a little... it will still change, but shouldn't as drastically.
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post #12 of 14 (permalink) Old 04-27-2017, 11:06 PM Thread Starter
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Originally Posted by Zoidburg View Post
So the pH drop would be just CO2? Okay.







If the substrate is indeed exhausted, then adding KH in some form may help to stabilize the pH a little... it will still change, but shouldn't as drastically.

Bump: So the pH drop would be just CO2? Okay.







If the substrate is indeed exhausted, then adding KH in some form may help to stabilize the pH a little... it will still change, but shouldn't as drastically.


What do you mean by stabilize my ph ? My ph doesn't really fluctuate. When co2 is off its around 7.6 and when co2 is on it drops to about 6.3.
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post #13 of 14 (permalink) Old 04-27-2017, 11:12 PM
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I'm saying that with KH in the tank, the pH may not drop as much when you have CO2 running.
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post #14 of 14 (permalink) Old 04-27-2017, 11:19 PM Thread Starter
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I'm saying that with KH in the tank, the pH may not drop as much when you have CO2 running.


Oh ok, so that would mean I could add more co2 since the ph won't drop as much
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